Screw-Thread Cutting since 1480, by Edwin A. Battison 31756 [Full title: Screw-Thread Cutting by the Master-Screw Method since 1480] [Link: http://www.gutenberg.org/3/1/7/5/31756 ] [Files: 31756.txt; 31756-8.txt; 31756-h.htm] Thanks to Colin Bell, Joseph Cooper, Louise Pattison and the Online Distributed Proofreading Team at http://www.pgdp.net Regards, Al